Features:<br /><br />1. Bluetooth 4.1 version， it could build faster connection and transmit stable signal in high speed， provide potent sound field.<br />2. Dual battery design， the earhook and the earphone could be separated， and both of them has built-in battery， prolong the battery life.<br />3. Intelligent voice prompt， it could indicate you the real-time state of the earphone and the phone number while there is a incoming call.<br />4. This earphone could be connected with two Bluetooth devices at the same time. Strong compatibility for most of Bluetooth devices.Specifications:General Specification  Model  Q8  Color  Black， White， Gold  Wearing Type  In-ear  Net Weight  13.8gTechnical Parameters  Microphone  Yes  Bluetooth Version  V4.1 + EDR  Transmission Distance  10m  Receive Sensitivity  80dB  Frequency<br />  Response  20-20kHz  Battery Capacity  135mAh， 3.7V  Charging Time (h)  2-3h  Taking Time  8-9h (only the earphone: 2.5-3.5h)  Working Time (h)  7-8h (only the earphone: 2-3h)  Standby Time (h)  150h (only the earphone: 45h)Package  Included: 1* Q8 Dual Battery Bluetooth Earphone 1* USB cable 2* earmuffs 1* Manual<br /><br />